Description : A metal is exposed to the atmosphere for some time. It becomes coated with green carbonate. The metal must be – (1) silver (2) copper (3) aluminium (4) zinc
Last Answer : (2) copper Explanation: Copper forms a rich variety of compounds with oxidation states +1 and +2, which are often called cuprous and cupric, respectively. It does not react with water, but it ... contrast to the oxidation of iron by wet air, this oxide layer stops the further, bulk corrosion.